Gave my 8 week old Drontal because I noticed worms in his stool. The vet weighed him and prescribed meds accordingly. I gave him 2 of them and about an hour later it was llike he drank a red bull! Running all over the house, into the furniture, snapping at everyone. I have to give him 2 more in 10 days!!! The vet said in 21 years shes never heard of this as a side effect. Anyone else out there notice these symptoms after Drontal was gven??